Your message dated Fri, 04 Sep 2026 15:55:30 +0000
with message-id <[email protected]>
and subject line Bug#1064320: fixed in eigen3 5.0.1-1
has caused the Debian Bug report #1064320,
regarding libeigen3-dev: linking objects compiled with different flags may
cause crashes
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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1064320: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1064320
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Contact [email protected] with problems
--- Begin Message ---
Package: libeigen3-dev
Version: 3.4.0-4
Severity: normal
X-Debbugs-Cc: none, Dima Kogan <[email protected]>
Hello. I'm making this report to track the report in this mailing list
thread:
https://www.mail-archive.com/[email protected]/msg13666.html
In short: there's a known issue in Eigen that can create crashing
binaries when using a very reasonable workflow. A description of the
issue and minimized reproducer are here:
https://www.mail-archive.com/[email protected]/msg13710.html
I propose to patch this in Debian and/or talk to Eigen upstream to
eliminate the cause of the crash. A proposed patch appears here:
https://www.mail-archive.com/[email protected]/msg13857.html
In my view, a questionable design choice in C++ allows the user to
create crashing code, and Eigen expoloits this design choice to make
this crashing possible.
We cannot fix C++, but we can fix Eigen. The issue is that a templated
function defined in a header generates a (weak symbol) copy of this
function in EACH compile unit, and the linker then picks an arbitrary
copy from the many compile units it is given. It is thus imperative that
each copy is compatible with every other copy. Eigen breaks this
requirement by using the preprocessor to select incompatible behaviors
that might crash when linked together. The proposed patch eliminates
this preprocessor-based variability.
--- End Message ---
--- Begin Message ---
Source: eigen3
Source-Version: 5.0.1-1
Done: Anton Gladky <[email protected]>
We believe that the bug you reported is fixed in the latest version of
eigen3, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Anton Gladky <[email protected]> (supplier of updated eigen3 package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Wed, 02 Sep 2026 21:04:27 +0200
Source: eigen3
Architecture: source
Version: 5.0.1-1
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers
<[email protected]>
Changed-By: Anton Gladky <[email protected]>
Closes: 1064320
Changes:
eigen3 (5.0.1-1) unstable; urgency=medium
.
* Upload to unstable.
* Add patch to make heap allocation independent of the build flags, so
that objects built with different -m flags no longer crash when linked
together. (Closes: #1064320)
* Add mixed-flags autopkgtest covering the above.
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